EP0805278A1 - Pneumatic actuating device - Google Patents

Pneumatic actuating device Download PDF

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Publication number
EP0805278A1
EP0805278A1 EP97400897A EP97400897A EP0805278A1 EP 0805278 A1 EP0805278 A1 EP 0805278A1 EP 97400897 A EP97400897 A EP 97400897A EP 97400897 A EP97400897 A EP 97400897A EP 0805278 A1 EP0805278 A1 EP 0805278A1
Authority
EP
European Patent Office
Prior art keywords
axial
bore
piston
chamber
pistons
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97400897A
Other languages
German (de)
French (fr)
Other versions
EP0805278B1 (en
Inventor
Eric Chauffeteau
Richard Chene
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caillau SAS
Original Assignee
Etablissements Caillau SAS
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Filing date
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Application filed by Etablissements Caillau SAS filed Critical Etablissements Caillau SAS
Publication of EP0805278A1 publication Critical patent/EP0805278A1/en
Application granted granted Critical
Publication of EP0805278B1 publication Critical patent/EP0805278B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/12—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears
    • B25B7/126—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears with fluid drive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/146—Clip clamping hand tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
    • F15B11/0365—Tandem constructions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/421—Flow control characterised by the type of actuation mechanically
    • F15B2211/423—Flow control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers
    • F15B2211/7056—Tandem cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/77—Control of direction of movement of the output member
    • F15B2211/7716—Control of direction of movement of the output member with automatic return

Definitions

  • the present invention relates to a pneumatic cylinder device comprising a cylinder body, means for supplying pressurized fluid inside this body, a first piston movable in a first axial chamber located at the rear of the cylinder body and, at least, a second piston movable in a second axial chamber situated in front of said first axial chamber.
  • the device further comprises a wall separating the two axial chambers having an axial bore and a piston connecting rod capable of sliding in leaktight manner in this bore.
  • This rod has a bore which opens, on the one hand, into the first axial chamber at the rear of the first piston and, on the other hand, into the second axial chamber behind the second piston.
  • the pistons are connected to a advancement member located at the front of the cylinder body.
  • the means for supplying pressurized fluid comprise a slide valve controlled by control means between a first position in which the fluid is directed into at least one axial chamber, behind the piston contained in this chamber, to urge the forward advancing member and a second position in which the fluid is directed into at least one axial chamber, at the front of the piston contained in this chamber, to urge the advancing member backwards .
  • a device of this type is known from the Swiss patent issued under No. 570 242.
  • the advancement member can for example be used for stamping or drilling parts, for example metal, by cooperating with a fixed member of adapted form. It can also, as is the case in the patent granted in the UNITED STATES under the number 3 410180, carry a wedge-shaped head which, while advancing, biases the jaws of pliers in the direction of closing them, while moving back it allows the opening of these jaws. In this case, the device can be used for hanging clamps or the like.
  • advancement member can be urged, either forwards or backwards.
  • a device of this type of common use must be able to be manufactured for as low a cost as possible. It is therefore necessary that the fluid circulation circuit, often compressed air, be as simple as possible without requiring the production of long conduits of very precise dimensions. It should also be noted that, particularly in the case where it is desired to use such a device for tightening clamps, its handling should be done in a very small space, such as the vehicle engine.
  • the fluid circulation circuit of Swiss Patent No. 570,242 is quite complicated. It has a compressed air inlet at the rear of the cylinder body, three parallel channels extending forwards, over a relatively long length, two movable slide valves in bores having conical valve seats, and a third movable slide valve in an axial bore.
  • the number of these parts, as well as their arrangement, is not compatible with the production of the device for a relatively low cost and in a reduced space requirement.
  • the actuator body of which is taken in hand by the user the control means must extend in a central region of the actuator body.
  • control means of the device described in Swiss patent number 570.242 consist of a very long and bulky lever. . This obviously constitutes a drawback from the point of manufacturing cost. It should also be noted that the larger the surface of the control member, the greater the risks of untimely manipulation.
  • the present invention proposes to improve the device of the aforementioned type by overcoming the drawbacks mentioned above.
  • the partition wall has a transverse bore in which the spool of the spool valve is located, a first conduit which connects the transverse bore to a pressurized fluid inlet, a second conduit which connects the transverse bore to the rear part of the second axial chamber, behind the second piston and a third conduit which connects the transverse bore to the front part of the first axial chamber, in front of the first piston, the first and second conduits being placed in communication and isolated from the third conduit in the first position of the slide valve, while, in the second position of this valve, the first and third conduits are put into communication and isolated from the second conduit.
  • control means comprise a control lever disposed substantially transversely to the cylinder body and having a first end, connected to this body in the region in the partition wall and pivotally mounted around a pivot axis directed substantially axially. , and a second end capable of cooperating with a free end of the valve spool.
  • the length of the lever (measured axially) is extremely reduced since it is located directly in the region of the partition wall.
  • This lever is directed substantially transversely and capable of being pivotally actuated about a pivot axis directed substantially axially with respect to the cylinder body, however, allows it to be given a sufficient lever arm so that it is easily maneuverable. .
  • this arrangement improves safety by providing the assembly with a compact shape which limits the risks of catching and inadvertent actuation.
  • Figures 1 to 4 show a pneumatic cylinder device comprising a cylinder body 10.
  • a first axial chamber 12 is formed in this cylinder body, at the rear of the latter, while a second axial chamber 14 is formed in the cylinder body, in front of the first.
  • a third axial chamber 16 is provided in front of the second.
  • a first, a second and a third piston, respectively designated by the references 18, 20 and 22 are respectively arranged in the first, second and third axial chambers and are movable in the latter. These pistons are connected to each other by a rod. More specifically, this rod comprises a first connecting rod 24 which connects the pistons 18 and 20, and a second connecting rod 26, or “additional connecting rod", which connects the pistons 20 and 22.
  • the axial chambers 12 and 14 are separated by a partition wall 28 which has an axial bore 30 in which the first connecting rod 24 slides. To make this sliding seal, a seal 32 is placed in a groove in this bore and cooperates with the external periphery of the rod 24.
  • an additional partition wall 34 separates the chambers 14 and 16. It also has an axial bore, this time designated by the reference 36 in which the second connecting rod slides 26. The sliding is sealed by a seal 38 disposed in a groove in bore 36.
  • the pistons are connected to a advancing member 40 located at the front of the cylinder body. More specifically, this advancement member is fixed to the front end of the rod which connects these pistons, that is to say, in the example shown, to the front end 42 of the second connecting rod 26 To this end, the advancement member has a thread 44 which cooperates with the threaded end 42 of the rod 26.
  • the front end 40a of the advancing member 40 is shaped in a corner, that is to say that it widens backwards.
  • Support arms 46 are arranged at the front of the jack body. These arms 46 are fixed to the front end of the jack body using a fixing ring 48 provided with a thread which cooperates with a thread of the front end of the jack body 10. These arms 46 support support plates 50 spaced from one another. Between these plates are mounted two clamp arms 52. Their front ends 52a are formed into jaws. Their rear ends comprise, for their part, rollers 52b able to cooperate with the wedge-shaped advancement member. By their median parts, the gripper arms 52 are connected to the support plates, each by a pivot axis 54. Spacer springs 56 are arranged inside the gripper arms, in the region of the axes 54. Thus , when, as is the case in FIG.
  • the advancement member is in its rear position, the springs 56 urge the arms so that their front ends move apart.
  • the advancement member is in its front position, it cooperates with the rollers 52b to spread the rear ends of the arms 52 and consequently bring their front ends 52a which are thus able to tighten a clamp.
  • the rod 24 has an axial bore 60 which, by its rear end 60a, opens into the first axial chamber 12 behind the first piston 18 and which, in the vicinity of its front end 60b, opens into the second chamber 14 to 1 'rear of the second piston 20.
  • the bore 60 is, near its front end, connected to a transverse bore 62 opening onto the axial peripheral wall of the rod 24 at the rear of the piston 20.
  • the rod 24 being connected to a second rod 26, the axial bore 60 still opens onto the free front end 60b.
  • the rod 26, for its part, also has an axial bore, designated by the reference 64, which, by its rear end, is connected to the front end 60b of the axial bore 60 of the first connecting rod 24.
  • the bore 64 further opens into the third axial chamber 16 at the rear of the third piston 22. To do this, it is connected to a transverse conduit 66 which opens on the axial periphery of the second connecting rod 26, behind the second piston 22. Furthermore, the front end 64b of the bore 64 is closed.
  • connection socket 67 for receiving the end of a pipe for supplying pressurized fluid, generally consisting of a flexible pipe for supplying pressurized air.
  • This connection is extended forward by a conduit 68 located on the side of the cylinder body and extending axially into the region of the wall of the cylinder. separation 28.
  • the length of this conduit is therefore slightly greater than the length, that is to say the axial dimension, of the first chamber 12. With the holes in the connecting rods, it is the only conduit of the device according to the invention which is relatively long.
  • the means for supplying the pressurized fluid comprise a slide valve visible in the sections of FIGS. 2, 5 and 6. It should be noted that, for the sake of simplification of the drawings, this valve is not entirely represented in the figures 1 and 4.
  • the slide valve 70 can be controlled in a first position which is that of FIGS. 4 and 6, in which the fluid is directed into at least one axial chamber at the rear of the piston contained in this chamber, which makes it possible to stress the forward advancing member 40.
  • the drawer can also be controlled in a second position, which is that of FIGS. 1, 2 and 5, in which the fluid is directed into at least one axial chamber, at the front of the piston contained in this chamber, so that the advancement member 40 is requested is the rear.
  • the slide 70 is movable in a transverse bore 72 located in the partition wall 28 between the first and second axial chambers 12 and 14. As can be seen better in FIG. 2, the bore extends parallel to a diameter of the body cylinder and is separated from the central bore 30 of the partition wall 28. Only the bore 72, without the slide 70, is shown in FIGS. 1 and 4.
  • this first conduit 75 comprises a first substantially radial section 74 connected to the front end of the conduit 68 and extending to a plane P which is a plane of symmetry of the bore 72 parallel to the axis " A "of the cylinder body. It is in this plane P that the cuts of FIGS. 5 and 6 are made.
  • the first conduit 75 comprises a second section 76 which extends parallel to this plane P and connects the first section 74 to the bore 72.
  • this second section comprises a part 78 which initially opens at one of the ends (the rear end) of the partition wall 28 and which is closed with a plug 80.
  • the position of the opening of the conduit 76 in the bore 72 is shown diagrammatically in FIG. 2.
  • the partition wall 28 has a second conduit 82 which connects the transverse bore 72 to the rear part of the second axial chamber 14.
  • This second conduit 82 has a single axial section. Its rear end opens onto the transverse bore 72 while its front end opens onto the front face 28a of the partition wall 28, which also constitutes the rear face of the axial chamber 14. Whatever the position of the second piston 20 inside this chamber, the second conduit 82 therefore opens at the rear of this second piston.
  • the partition wall 28 comprises a third conduit 84 which connects the transverse bore 72 to the front part of the first axial chamber 12.
  • the third conduit comprises a single axial section. Its front end opens into the transverse bore 72 while its rear end opens onto the rear face 28b of the partition wall 28, which also constitutes the front end of the first axial chamber 12. Consequently, what whatever the position of the first piston 18 inside the first axial chamber, the third conduit 84 opens at the front of this piston.
  • the partition wall 28 is long enough to accommodate these different conduits. Its length is for example of the order of two to three times the diameter of bore 72.
  • the drawer 70 comprises a substantially cylindrical body 86 having two bulged zones 88 and 90 provided with seals and spaced from one another.
  • the openings of these three conduits in the bore are regularly spaced.
  • the spacing between the two bulges 88 and 90 of the body of the drawer is very slightly greater than the spacing between two conduits.
  • the operation of the device is as follows.
  • the slide 70 is pushed towards the bottom 72b of the bore 72, which is possible thanks to the fact that the air located in front of the bulge 88 can be expelled by the discharge bore 92, the fluid entering through the conduits 68, 74 and 76 can enter the rear of the second chamber 14 through the second conduit 82 of the partition wall 28.
  • This fluid therefore tends to push the second piston 20 forward.
  • the fluid penetrates through the bore 62 in the bore 60 of the rod 24 and is thus led to the rear of the first axial chamber 12, so that its action is also exerted at the rear of the first piston 18.
  • the conduit 84 is placed in communication with the outside by a bore 94 which equips the ring 96 for guiding the rod 98 of the drawer 70.
  • the fluid located at the front of this chamber is directly evacuated by a bore 100 made in the wall of this chamber, at its front end.
  • the fluid located in the front part of the third chamber 16 can naturally be evacuated at the front of this chamber because no sealing system is provided between the advancing member, the arms of support 46 and ring 48.
  • the control means of the slide valve comprise a control lever 102 disposed substantially transversely. As can best be seen in FIG. 2, this lever 102 has a first end 102a connected to the cylinder body 10 in the region of the partition wall 28. This first end 102a is pivotally mounted around a pivot axis 104, better visible in Figures 1 and 4 directed substantially along the axis A of the cylinder body. The second end 102b of the lever 102 cooperates with the free end 99 of the drawer 70.
  • this lever is directly connected to the partition wall 28, and is therefore only located in a central region of the cylinder body.
  • the partition wall has a transverse slot 29 in which is housed the first end 102a of the lever.
  • the lever 102 is almost entirely contained in the slot 29.
  • the first and second ends of the lever are relatively distant from each other.
  • the lever extends over more than a quarter of the circumference of the cylinder body. It is therefore also the case of the slot 29 which receives it for the most part. The lever being bent, the slot 29 is also.
  • the device advantageously comprises elastic means for naturally urging the drawer 70 into its second position, in which the advancement member is pushed back.
  • elastic means for naturally urging the drawer 70 into its second position, in which the advancement member is pushed back.
  • these elastic means consist of a simple spring 106 which bears, on the one hand, on the internal face of the enlarged free end 99 of the drawer and, on the other hand, on the external face of the guide ring 96, fixed in the bore 72, in which the rod 98 of the drawer slides.
  • a spiral spring possibly disposed between the bottom 72b of the bore and the internal end of the slide located below the bulge 88.
  • the device advantageously comprises means for damping the movement of at least one of the pistons at the end of the travel stroke, in at least one of the directions of movement of the advancement member.
  • the pistons being connected to each other by the connecting rods, these means in fact absorb the movement of the assembly formed by the pistons, their rod and the advancement member.
  • these damping means consist of a bulge 108 made of a relatively flexible material, for example of the rubber type or the like, formed on the rear face of the first piston 18.
  • a bulge 108 made of a relatively flexible material, for example of the rubber type or the like, formed on the rear face of the first piston 18.
  • the piston 18 in fact comprises a metal core 18a and an outer ring 18b, of relatively flexible material, which surrounds this core and is provided with bulges. It is advantageous that the position of extreme advancement of the assembly, which obviously defines the extreme front position of the advancement member 40, is very precisely defined so that the active position of the jaws 52a is also.
  • the device advantageously comprises first abutment means arranged in one of the axial chambers, in the vicinity of its front end, and second abutment means arranged on the piston which is located in this chamber, in the vicinity of the front of this piston.
  • the first and second stop means cooperate with each other when the assembly constituted by the pistons, their connecting rod and the advancement member is pushed forward, so that they define the position of extreme advancement of this assembly.
  • these abutment means are very simple since the first abutment means are constituted by the front face of the third chamber 16, the front face itself defined by the rear ends 46b of the support arms 46, while the second abutment means consist of the front face 22a of the third piston 22. It is obviously possible to provide for these abutment means in another of the axial chambers. However, the precise position of the arms 46 is determined by the screwing of the assembly ring 48. This makes it possible to precisely define the position of the first stop means, leaving a possibility of adjustment.
  • the device advantageously comprises at least one annular bearing 110 disposed in the bore 30 of the partition wall 28 and made of a material with a low coefficient of friction.
  • this bearing can cooperate with the external periphery of the connecting rod 24 by facilitating its sliding in the bore.
  • a similar pad 112 is also placed in the bore 36 of the additional partition wall, when the latter is present.
  • the fact of providing these bearings does not exclude the arrangement of the seals 32 and 38 in the bores.
  • the peripheral faces of the different pistons cooperating with the axial walls of the chambers are provided with seals 118, 120 and 122.
  • the front and rear ends of the connecting rods 24 and 26 cooperate by screwing.
  • wedging washers 124 equip the rear faces of the pistons 20 and 22.
  • the rear end of the connecting rod 24 is threaded.
  • the rear face of the first piston 18 has a recess 126 capable of receiving a fixing nut 128 screwed onto the rear end of the rod.
  • the position of the piston relative to the rod is locked using a wedging washer 130 located on the front face of this piston and cooperating with a shoulder of the rod.
  • the jack body has three main elements constituted by blind tubes.
  • the first tube 132 defines the first chamber 12. These rear and side walls have the connection pipes at the pressurized fluid inlet.
  • the cavity of the second tube 134 forms the second axial chamber 14.
  • the rear wall of this tube constitutes the partition wall between the chambers 12 and 14. It is therefore it which is provided with the bore 72 and the various conduits previously mentioned. .
  • This wall is connected by screwing to the front end of the first tube 132.
  • the cavity of the third tube 136 forms the third axial chamber 16, while its rear wall forms the wall 34 of separation between the chambers 14 and 16. This rear wall is screwed into the front end of the second tube 134.
  • seals 138 are arranged in the screwing zone between the different tubes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Types And Forms Of Lifts (AREA)

Abstract

The assembly consists of a housing (10) with a pressure substance feed and two axial chambers (12,14) with pistons (18,20) connected by a rod (24) passing through a dividing partition (28). The pressure substance feed incorporates a slide valve (70) located in a transverse port (72) in the partition, linked by channels (74,76) to an intake (68) and by other channels to the piston chambers. The slide valve is controlled by a lever (102) situated transversely relative to the cylinder housing. It has one end (102a) pivoted to the housing at a point adjacent to the partition and able to pivot about an axis lying parallel to that of the housing. The other end (102b) of the lever is able to interact with the free end of the slide valve.

Description

La présente invention concerne un dispositif de vérin pneumatique comprenant un corps de vérin, des moyens d'amenée de fluide sous pression à l'intérieur de ce corps, un premier piston mobile dans une première chambre axiale située à l'arrière du corps de vérin et, au moins, un deuxième piston mobile dans une deuxième chambre axiale située en avant de ladite première chambre axiale. Le dispositif comprend, en outre, une paroi de séparation des deux chambres axiales présentant un alésage axial et une tige de liaison des pistons apte à coulisser de manière étanche dans cet alésage. Cette tige présente un perçage qui débouche, d'une part, dans la première chambre axiale à l'arrière du premier piston et, d'autre part, dans la deuxième chambre axiale à l'arrière du deuxième piston. Les pistons sont raccordés à un organe d'avancement situé à l'avant du corps de vérin. Les moyens d'amenée de fluide sous pression comprennent une vanne à tiroir commandée par des moyens de commande entre une première position dans laquelle le fluide est dirigé dans au moins une chambre axiale, à l'arrière du piston contenu dans cette chambre, pour solliciter l'organe d'avancement vers l'avant et une deuxième position dans laquelle le fluide est dirigé dans au moins une chambre axiale, à l'avant du piston contenu dans cette chambre, pour solliciter l'organe d'avancement vers l'arrière.The present invention relates to a pneumatic cylinder device comprising a cylinder body, means for supplying pressurized fluid inside this body, a first piston movable in a first axial chamber located at the rear of the cylinder body and, at least, a second piston movable in a second axial chamber situated in front of said first axial chamber. The device further comprises a wall separating the two axial chambers having an axial bore and a piston connecting rod capable of sliding in leaktight manner in this bore. This rod has a bore which opens, on the one hand, into the first axial chamber at the rear of the first piston and, on the other hand, into the second axial chamber behind the second piston. The pistons are connected to a advancement member located at the front of the cylinder body. The means for supplying pressurized fluid comprise a slide valve controlled by control means between a first position in which the fluid is directed into at least one axial chamber, behind the piston contained in this chamber, to urge the forward advancing member and a second position in which the fluid is directed into at least one axial chamber, at the front of the piston contained in this chamber, to urge the advancing member backwards .

Un dispositif de ce type est connu par le brevet suisse délivré sous le n° 570 242. L'organe d'avancement peut par exemple servir à l'estampage ou au perçage de pièces, par exemple métalliques, en coopérant avec un organe fixe de forme adaptée. Il peut également, comme c'est le cas dans le brevet délivré aux ETATS-UNIS sous le n° 3 410180, porter une tête en forme de coin qui, en s'avançant, sollicite les mâchoires d'une pince dans le sens de leur fermeture, tandis qu'en reculant elle permet l'ouverture de ces mâchoires. Dans ce cas, le dispositif peut être utilisé pour l'accrochage de colliers de serrage ou analogues.A device of this type is known from the Swiss patent issued under No. 570 242. The advancement member can for example be used for stamping or drilling parts, for example metal, by cooperating with a fixed member of adapted form. It can also, as is the case in the patent granted in the UNITED STATES under the number 3 410180, carry a wedge-shaped head which, while advancing, biases the jaws of pliers in the direction of closing them, while moving back it allows the opening of these jaws. In this case, the device can be used for hanging clamps or the like.

C'est donc directement sous l'action du fluide que l'organe d'avancement peut être sollicité, soit vers l'avant, soit vers l'arrière.It is therefore directly under the action of the fluid that the advancement member can be urged, either forwards or backwards.

Un dispositif de ce type d'usage courant, doit pouvoir être fabriqué pour un coût aussi modique que possible. Il faut donc que le circuit de circulation du fluide, souvent de l'air comprimé, soit aussi simple que possible sans nécessiter la réalisation de longs conduits de dimensions très précises. Il faut également noter que, particulièrement dans le cas où l'on souhaite utiliser un tel dispositif pour serrer des colliers de serrage, sa manipulation doit se faire dans un espace très réduit, tel que le moteur à véhicule.A device of this type of common use, must be able to be manufactured for as low a cost as possible. It is therefore necessary that the fluid circulation circuit, often compressed air, be as simple as possible without requiring the production of long conduits of very precise dimensions. It should also be noted that, particularly in the case where it is desired to use such a device for tightening clamps, its handling should be done in a very small space, such as the vehicle engine.

Le circuit de circulation de fluide du brevet suisse n° 570 242 est assez compliqué. Il comporte une arrivée d'air comprimé à l'arrière du corps de vérin, trois canaux parallèles s'étendant vers l'avant, sur une longueur relativement importante, deux vannes à tiroir mobiles dans des alésages présentant des sièges de soupape conique, et une troisième vanne à tiroir mobile dans un alésage axial. Le nombre de ces pièces, ainsi que leur disposition, n'est pas compatible avec la réalisation du dispositif pour un coût relativement modique et dans un encombrement réduit. Pour permettre la manipulation du dispositif, dont le corps de vérin est pris en mains par l'utilisateur, il faut que les moyens de commande s'étendent dans une région centrale du corps de vérin. Pour rendre cette nécessité compatible avec une arrivée de fluide sous pression et les vannes à tiroir situées à l'arrière du corps de vérin, les moyens de commande du dispositif décrit dans le brevet suisse numéro 570.242 sont constitués par un levier très long et très encombrant. Ceci constitue évidemment un inconvénient du point du coût de la fabrication. Il faut également noter que plus la surface de l'organe de commande est importante, plus les risques de manipulation intempestive sont grands.The fluid circulation circuit of Swiss Patent No. 570,242 is quite complicated. It has a compressed air inlet at the rear of the cylinder body, three parallel channels extending forwards, over a relatively long length, two movable slide valves in bores having conical valve seats, and a third movable slide valve in an axial bore. The number of these parts, as well as their arrangement, is not compatible with the production of the device for a relatively low cost and in a reduced space requirement. To allow manipulation of the device, the actuator body of which is taken in hand by the user, the control means must extend in a central region of the actuator body. To make this need compatible with a pressurized fluid inlet and the slide valves located at the rear of the cylinder body, the control means of the device described in Swiss patent number 570.242 consist of a very long and bulky lever. . This obviously constitutes a drawback from the point of manufacturing cost. It should also be noted that the larger the surface of the control member, the greater the risks of untimely manipulation.

La présente invention se propose d'améliorer le dispositif du type précité en remédiant aux inconvénients évoqués ci-dessus.The present invention proposes to improve the device of the aforementioned type by overcoming the drawbacks mentioned above.

Ce but est atteint grâce au fait que la paroi de séparation présente un alésage transversal dans lequel est situé le tiroir de la vanne à tiroir, un premier conduit qui relie l'alésage transversal à une arrivée de fluide sous pression, un deuxième conduit qui raccorde l'alésage transversal à la partie arrière de la deuxième chambre axiale, en arrière du deuxième piston et un troisième conduit qui raccorde l'alésage transversal à la partie avant de la première chambre axiale, en avant du premier piston, les premier et deuxième conduits étant mis en communication et isolés du troisième conduit dans la première position de la vanne à tiroir, tandis que, dans la deuxième position de cette vanne, les premier et troisième conduits sont mis en communication et isolés du deuxième conduit.This object is achieved thanks to the fact that the partition wall has a transverse bore in which the spool of the spool valve is located, a first conduit which connects the transverse bore to a pressurized fluid inlet, a second conduit which connects the transverse bore to the rear part of the second axial chamber, behind the second piston and a third conduit which connects the transverse bore to the front part of the first axial chamber, in front of the first piston, the first and second conduits being placed in communication and isolated from the third conduit in the first position of the slide valve, while, in the second position of this valve, the first and third conduits are put into communication and isolated from the second conduit.

On comprend que grâce à l'invention, les différents conduits peuvent être usinés de manière très simple dans la paroi de séparation, ce qui permet de réduire considérablement leur longueur. De plus, cette disposition permet d'utilisation d'une seule vanne à tiroir, placée dans un seul alésage dans lequel différents conduits de circulation du fluide débouchent à des positions judicieusement réparties. Il faut également noter que le fait que le tiroir de la vanne à tiroir se trouve dans l'alésage, lui-même ménagé dans la paroi de séparation, situe déjà ce tiroir dans une région centrale du corps de vérin. Il est par conséquent plus facile de situer les moyens de commande de ce tiroir, eux aussi dans une région centrale, ce qui permet d'en diminuer la longueur.It is understood that thanks to the invention, the various conduits can be machined very simply in the partition wall, which makes it possible to considerably reduce their length. In addition, this provision allows use of a single slide valve, placed in a single bore in which different fluid circulation conduits open in judiciously distributed positions. It should also be noted that the fact that the slide valve of the slide valve is located in the bore, itself formed in the partition wall, already places this slide in a central region of the cylinder body. It is therefore easier to locate the control means of this drawer, also in a central region, which makes it possible to reduce the length.

De préférence, ces moyens de commande comprennent un levier de commande disposé sensiblement transversalement au corps de vérin et ayant une première extrémité, raccordée à ce corps dans la région dans la paroi de séparation et montée pivotante autour d'un axe de pivotement dirigé sensiblement axialement, et une deuxième extrémité apte à coopérer avec une extrémité libre du tiroir de la vanne.Preferably, these control means comprise a control lever disposed substantially transversely to the cylinder body and having a first end, connected to this body in the region in the partition wall and pivotally mounted around a pivot axis directed substantially axially. , and a second end capable of cooperating with a free end of the valve spool.

Dans ce cas, la longueur du levier (mesurée axialement) est extrêmement réduite puisqu'il se situe directement dans la région de la paroi de séparation. Le fait que ce levier soit dirigé sensiblement transversalement et susceptible d'être actionné en pivotement autour d'un axe de pivotement dirigé sensiblement axialement par rapport au corps de vérin permet toutefois de lui donner un bras de levier suffisant pour qu'il soit facilement manoeuvrable. De plus, cette disposition permet d'améliorer la sécurité en dotant l'ensemble d'une forme compacte qui limite les risques d'accrochage et d'actionnement intempestif.In this case, the length of the lever (measured axially) is extremely reduced since it is located directly in the region of the partition wall. The fact that this lever is directed substantially transversely and capable of being pivotally actuated about a pivot axis directed substantially axially with respect to the cylinder body, however, allows it to be given a sufficient lever arm so that it is easily maneuverable. . In addition, this arrangement improves safety by providing the assembly with a compact shape which limits the risks of catching and inadvertent actuation.

L'invention sera bien comprise et ses avantages apparaîtront mieux à la lecture de la description détaillée qui suit, d'un mode de réalisation représenté à titre d'exemple non limitatif.The invention will be clearly understood and its advantages will appear better on reading the detailed description which follows, of an embodiment shown by way of nonlimiting example.

La description se réfère aux dessins annexés sur lesquels :

  • la figure 1 est une vue en coupe axiale d'un dispositif conforme à l'invention montrant l'organe d'avancement dans sa position arrière,
  • la figure 2 est une vue en coupe transversale selon la ligne II-II de la figure 1,
  • la figure 3 est une vue de dessus de la figure 1,
  • la figure 4 est une coupe analogue à celle de la figure 1, montrant l'organe d'avancement en position avant,
  • la figure 5 est une section partielle selon la ligne V-V de la figure 1, et
  • la figure 6 est une section partielle, analogue à celle de la figure 5, selon la ligne VI-VI de la figure 4.
The description refers to the accompanying drawings in which:
  • FIG. 1 is a view in axial section of a device according to the invention showing the advancement member in its rear position,
  • FIG. 2 is a cross-sectional view along the line II-II of FIG. 1,
  • FIG. 3 is a top view of FIG. 1,
  • FIG. 4 is a section similar to that of FIG. 1, showing the advancement member in the front position,
  • FIG. 5 is a partial section along the line VV of FIG. 1, and
  • FIG. 6 is a partial section, similar to that of FIG. 5, along the line VI-VI of FIG. 4.

Les figures 1 à 4 montrent un dispositif de vérin pneumatique comprenant un corps de vérin 10. Une première chambre axiale 12 est ménagée dans ce corps de vérin, à l'arrière de ce dernier, tandis qu'une deuxième chambre axiale 14 est ménagée dans le corps de vérin, en avant de la première. En outre, une troisième chambre axiale 16 est ménagée en avant de la deuxième.Figures 1 to 4 show a pneumatic cylinder device comprising a cylinder body 10. A first axial chamber 12 is formed in this cylinder body, at the rear of the latter, while a second axial chamber 14 is formed in the cylinder body, in front of the first. In addition, a third axial chamber 16 is provided in front of the second.

Un premier, un deuxième et un troisième piston, respectivement désignés par les références 18, 20 et 22 sont respectivement disposés dans les première, deuxième et troisième chambres axiales et sont mobiles dans ces dernières. Ces pistons sont raccordés les uns aux autres par une tige. Plus précisément, cette tige comporte une première tige de liaison 24 qui relie les pistons 18 et 20, et une deuxième tige de liaison 26, ou "tige de liaison supplémentaire", qui relie les pistons 20 et 22. Les chambres axiales 12 et 14 sont séparées par une paroi de séparation 28 qui présente un alésage axial 30 dans lequel la première tige de liaison 24 coulisse. Pour rendre ce coulissement étanche, un joint 32 est disposé dans une gorge de cet alésage et coopère avec la périphérie externe de la tige 24.A first, a second and a third piston, respectively designated by the references 18, 20 and 22 are respectively arranged in the first, second and third axial chambers and are movable in the latter. These pistons are connected to each other by a rod. More specifically, this rod comprises a first connecting rod 24 which connects the pistons 18 and 20, and a second connecting rod 26, or "additional connecting rod", which connects the pistons 20 and 22. The axial chambers 12 and 14 are separated by a partition wall 28 which has an axial bore 30 in which the first connecting rod 24 slides. To make this sliding seal, a seal 32 is placed in a groove in this bore and cooperates with the external periphery of the rod 24.

De même, une paroi supplémentaire de séparation 34 sépare les chambres 14 et 16. Elle présente également un alésage axial, cette fois désigné par la référence 36 dans lequel coulisse la deuxième tige de liaison 26. Le coulissement est rendu étanche par un joint 38 disposé dans une gorge de l'alésage 36.Similarly, an additional partition wall 34 separates the chambers 14 and 16. It also has an axial bore, this time designated by the reference 36 in which the second connecting rod slides 26. The sliding is sealed by a seal 38 disposed in a groove in bore 36.

Les pistons sont raccordés à un organe d'avancement 40 situé à l'avant du corps de vérin. Plus précisément, cet organe d'avancement est fixé à l'extrémité avant de la tige qui relie ces pistons, c'est-à-dire, dans l'exemple représenté, à l'extrémité avant 42 de la deuxième tige de liaison 26. A cet effet, l'organe d'avancement présente un taraudage 44 qui coopère avec l'extrémité filetée 42 de la tige 26.The pistons are connected to a advancing member 40 located at the front of the cylinder body. More specifically, this advancement member is fixed to the front end of the rod which connects these pistons, that is to say, in the example shown, to the front end 42 of the second connecting rod 26 To this end, the advancement member has a thread 44 which cooperates with the threaded end 42 of the rod 26.

Dans l'exemple représenté, l'extrémité avant 40a de l'organe d'avancement 40 est conformé en coin, c'est-à-dire qu'elle va en s'évasant vers l'arrière.In the example shown, the front end 40a of the advancing member 40 is shaped in a corner, that is to say that it widens backwards.

A l'avant du corps de vérin sont disposés des bras de support 46. Ces bras 46 sont fixés à l'extrémité avant du corps de vérin à l'aide d'une bague de fixation 48 munie d'un taraudage qui coopère avec un filetage de l'extrémité avant du corps de vérin 10. Ces bras 46 supportent des platines de support 50 espacées l'une de l'autre. Entre ces platines sont montés deux bras de pince 52. Leurs extrémités avants 52a sont conformées en mâchoires. Leurs extrémités arrières comportent, quant à elles, des galets de roulement 52b aptes à coopérer avec l'organe d'avancement en forme de coin. Par leurs parties médianes, les bras de pince 52 sont raccordées aux platines de support, chacun par un axe de pivotement 54. Des ressorts d'écartement 56 sont disposés à l'intérieur des bras de pince, dans la région des axes 54. Ainsi, lorsque comme c'est le cas sur la figure 1, l'organe d'avancement est dans sa position arrière, les ressorts 56 sollicitent les bras de telle sorte que leurs extrémités avants s'écartent. Lorsque, en revanche comme c'est le cas sur la figure 4, l'organe d'avancement est dans sa position avant, il coopère avec les galets 52b pour écarter les extrémités arrières des bras 52 et rapprocher par conséquent leurs extrémités avants 52a qui sont ainsi aptes à serrer un collier de serrage.Support arms 46 are arranged at the front of the jack body. These arms 46 are fixed to the front end of the jack body using a fixing ring 48 provided with a thread which cooperates with a thread of the front end of the jack body 10. These arms 46 support support plates 50 spaced from one another. Between these plates are mounted two clamp arms 52. Their front ends 52a are formed into jaws. Their rear ends comprise, for their part, rollers 52b able to cooperate with the wedge-shaped advancement member. By their median parts, the gripper arms 52 are connected to the support plates, each by a pivot axis 54. Spacer springs 56 are arranged inside the gripper arms, in the region of the axes 54. Thus , when, as is the case in FIG. 1, the advancement member is in its rear position, the springs 56 urge the arms so that their front ends move apart. When, on the other hand as is the case in FIG. 4, the advancement member is in its front position, it cooperates with the rollers 52b to spread the rear ends of the arms 52 and consequently bring their front ends 52a which are thus able to tighten a clamp.

La tige 24 présente un perçage axial 60 qui, par son extrémité arrière 60a, débouche dans la première chambre axiale 12 à l'arrière du premier piston 18 et qui, au voisinage de son extrémité avant 60b, débouche dans la deuxième chambre 14 à l'arrière du deuxième piston 20. Pour ce faire, le perçage 60 est, au voisinage de son extrémité avant, raccordé à un perçage transversal 62 s'ouvrant sur la paroi périphérique axiale de la tige 24 à l'arrière du piston 20.The rod 24 has an axial bore 60 which, by its rear end 60a, opens into the first axial chamber 12 behind the first piston 18 and which, in the vicinity of its front end 60b, opens into the second chamber 14 to 1 'rear of the second piston 20. To do this, the bore 60 is, near its front end, connected to a transverse bore 62 opening onto the axial peripheral wall of the rod 24 at the rear of the piston 20.

La tige 24 étant raccordée à une deuxième tige 26, le perçage axial 60 débouche encore sur l'extrémité libre avant 60b. La tige 26 présente, quant à elle, également un perçage axial, désigné par la référence 64, qui, par son extrémité arrière, est raccordée à l'extrémité avant 60b du perçage axial 60 de la première tige de liaison 24. Le perçage 64 débouche en outre dans la troisième chambre axiale 16 à l'arrière du troisième piston 22. Pour ce faire, il est raccordé à un conduit transversal 66 qui s'ouvre sur la périphérie axiale de la deuxième tige de liaison 26, en arrière du deuxième piston 22. Par ailleurs, l'extrémité avant 64b du perçage 64 est fermée.The rod 24 being connected to a second rod 26, the axial bore 60 still opens onto the free front end 60b. The rod 26, for its part, also has an axial bore, designated by the reference 64, which, by its rear end, is connected to the front end 60b of the axial bore 60 of the first connecting rod 24. The bore 64 further opens into the third axial chamber 16 at the rear of the third piston 22. To do this, it is connected to a transverse conduit 66 which opens on the axial periphery of the second connecting rod 26, behind the second piston 22. Furthermore, the front end 64b of the bore 64 is closed.

A l'arrière du corps de vérin 10, se trouve une prise de branchement 67 pour recevoir l'extrémité d'un tuyau d'amenée de fluide sous pression, en général constitué par un flexible d'amenée d'air sous pression. Ce branchement se prolonge vers l'avant par un conduit 68 situé sur le côté du corps de vérin et s'étendant axialement jusque dans la région de la paroi de séparation 28. La longueur de ce conduit est donc légèrement supérieure à la longueur, c'est-à-dire à la dimension axiale, de la première chambre 12. Avec les perçages des tiges de liaison, c'est le seul conduit du dispositif selon l'invention qui soit relativement long.At the rear of the jack body 10, there is a connection socket 67 for receiving the end of a pipe for supplying pressurized fluid, generally consisting of a flexible pipe for supplying pressurized air. This connection is extended forward by a conduit 68 located on the side of the cylinder body and extending axially into the region of the wall of the cylinder. separation 28. The length of this conduit is therefore slightly greater than the length, that is to say the axial dimension, of the first chamber 12. With the holes in the connecting rods, it is the only conduit of the device according to the invention which is relatively long.

Les moyens d'amenée du fluide sous pression comprennent une vanne à tiroir visible sur les coupes des figures 2, 5 et 6. Il faut noter, que dans un souci de simplification des dessins, cette vanne n'est pas entièrement représentée sur les figures 1 et 4.The means for supplying the pressurized fluid comprise a slide valve visible in the sections of FIGS. 2, 5 and 6. It should be noted that, for the sake of simplification of the drawings, this valve is not entirely represented in the figures 1 and 4.

Le tiroir 70 de la vanne peut être commandé dans une première position qui est celle des figures 4 et 6, dans laquelle le fluide est dirigé dans au moins une chambre axiale à l'arrière du piston contenu dans cette chambre, ce qui permet de solliciter l'organe d'avancement 40 vers l'avant. Le tiroir peut également être commandé dans une deuxième position, qui est celle des figures 1, 2 et 5, dans laquelle le fluide est dirigé dans au moins une chambre axiale, à l'avant du piston contenu dans cette chambre, de telle sorte que l'organe d'avancement 40 est sollicité est l'arrière.The slide valve 70 can be controlled in a first position which is that of FIGS. 4 and 6, in which the fluid is directed into at least one axial chamber at the rear of the piston contained in this chamber, which makes it possible to stress the forward advancing member 40. The drawer can also be controlled in a second position, which is that of FIGS. 1, 2 and 5, in which the fluid is directed into at least one axial chamber, at the front of the piston contained in this chamber, so that the advancement member 40 is requested is the rear.

Le tiroir 70 est mobile dans un alésage transversal 72 situé dans la paroi de séparation 28 entre les première et deuxième chambres axiales 12 et 14. Comme on le voit mieux sur la figure 2, l'alésage s'étend parallèlement à un diamètre du corps de vérin et est disjoint de l'alésage central 30 de la paroi de séparation 28. Seul l'alésage 72, sans le tiroir 70, est représenté sur les figures 1 et 4.The slide 70 is movable in a transverse bore 72 located in the partition wall 28 between the first and second axial chambers 12 and 14. As can be seen better in FIG. 2, the bore extends parallel to a diameter of the body cylinder and is separated from the central bore 30 of the partition wall 28. Only the bore 72, without the slide 70, is shown in FIGS. 1 and 4.

On décrit maintenant les différents conduits de circulation de fluide ménagés dans la paroi de séparation 28. Comme on le voit sur la figure 1, elle comprend tout d'abord un premier conduit qui relie l'alésage 72 à l'arrivée de fluide sous pression. Plus précisément, ce premier conduit 75 comporte un premier tronçon 74 sensiblement radial raccordé à l'extrémité avant du conduit 68 et s'étendant jusqu'à un plan P qui est un plan de symétrie de l'alésage 72 parallèle à l'axe "A" du corps de vérin. C'est dans ce plan P que sont pratiquées les coupes des figures 5 et 6. Le premier conduit 75 comporte un deuxième tronçon 76 qui s'étend parallèlement à ce plan P et relie le premier tronçon 74 à l'alésage 72. Pour faciliter son usinage, ce deuxième tronçon comporte une partie 78 qui débouchait initialement à l'une des extrémités (l'extrémité arrière) de la paroi de séparation 28 et qui est obturée à l'aide d'un bouchon 80. La position de l'ouverture du conduit 76 dans l'alésage 72 est indiquée schématiquement sur la figure 2.We will now describe the various fluid circulation conduits formed in the partition wall 28. As can be seen in FIG. 1, it firstly comprises a first conduit which connects the bore 72 to the pressurized fluid inlet. . More specifically, this first conduit 75 comprises a first substantially radial section 74 connected to the front end of the conduit 68 and extending to a plane P which is a plane of symmetry of the bore 72 parallel to the axis " A "of the cylinder body. It is in this plane P that the cuts of FIGS. 5 and 6 are made. The first conduit 75 comprises a second section 76 which extends parallel to this plane P and connects the first section 74 to the bore 72. To facilitate its machining, this second section comprises a part 78 which initially opens at one of the ends (the rear end) of the partition wall 28 and which is closed with a plug 80. The position of the opening of the conduit 76 in the bore 72 is shown diagrammatically in FIG. 2.

En se reportant aux figures 5 et 6, on voit que la paroi de séparation 28 présente un deuxième conduit 82 qui raccorde l'alésage transversal 72 à la partie arrière de la deuxième chambre axiale 14. Ce deuxième conduit 82 comporte un unique tronçon axial. Son extrémité arrière s'ouvre sur l'alésage transversal 72 tandis que son extrémité avant s'ouvre sur la face avant 28a de la paroi de séparation 28, qui constitue également la face arrière de la chambre axiale 14. Quelle que soit la position du deuxième piston 20 à l'intérieur de cette chambre, le deuxième conduit 82 s'ouvre donc à l'arrière de ce deuxième piston.Referring to Figures 5 and 6, we see that the partition wall 28 has a second conduit 82 which connects the transverse bore 72 to the rear part of the second axial chamber 14. This second conduit 82 has a single axial section. Its rear end opens onto the transverse bore 72 while its front end opens onto the front face 28a of the partition wall 28, which also constitutes the rear face of the axial chamber 14. Whatever the position of the second piston 20 inside this chamber, the second conduit 82 therefore opens at the rear of this second piston.

La paroi de séparation 28 comporte un troisième conduit 84 qui raccorde l'alésage transversal 72 à la partie avant de la première chambre axiale 12. A l'instar du deuxième conduit 82, le troisième conduit comporte un unique tronçon axial. Son extrémité avant s'ouvre dans l'alésage transversal 72 tandis que son extrémité arrière s'ouvre sur la face arrière 28b de la paroi de séparation 28, qui constitue également l'extrémité avant de la première chambre axiale 12. Par conséquent, quelle que soit la position du premier piston 18 à l'intérieur de la première chambre axiale, le troisième conduit 84 s'ouvre à l'avant de ce piston.The partition wall 28 comprises a third conduit 84 which connects the transverse bore 72 to the front part of the first axial chamber 12. Like the second conduit 82, the third conduit comprises a single axial section. Its front end opens into the transverse bore 72 while its rear end opens onto the rear face 28b of the partition wall 28, which also constitutes the front end of the first axial chamber 12. Consequently, what whatever the position of the first piston 18 inside the first axial chamber, the third conduit 84 opens at the front of this piston.

La paroi de séparation 28 est suffisamment longue pour loger ces différents conduits. Sa longueur est par exemple de l'ordre de deux à trois fois le diamètre de l'alésage 72.The partition wall 28 is long enough to accommodate these different conduits. Its length is for example of the order of two to three times the diameter of bore 72.

Le tiroir 70 comporte un corps sensiblement cylindrique 86 présentant deux zones renflées 88 et 90 munies de joints d'étanchéité et écartées l'une de l'autre.The drawer 70 comprises a substantially cylindrical body 86 having two bulged zones 88 and 90 provided with seals and spaced from one another.

Dans la première position du tiroir illustrée par la figure 6, on voit que le premier conduit 75, plus précisément son tronçon 76, est mis en communication avec le deuxième conduit 82, tandis que le troisième conduit 84 est isolé. En revanche, dans la deuxième position illustrée par la figure 5, les premier et troisième conduits 75 et 84 sont mis en communication, tandis que le deuxième conduit 82 est isolé.In the first position of the drawer illustrated in FIG. 6, it can be seen that the first conduit 75, more precisely its section 76, is placed in communication with the second conduit 82, while the third conduit 84 is isolated. On the other hand, in the second position illustrated by FIG. 5, the first and third conduits 75 and 84 are put in communication, while the second conduit 82 is isolated.

En fait, si l'on considère l'alésage transversal 72 depuis son ouverture 72a, en dehors de laquelle peut dépasser l'extrémité libre du tiroir, jusqu'à son fond 72b, on constate que les troisième, premier et deuxième conduits 84, 75 (76) et 82 sont successivement raccordés à l'alésage transversal 72.In fact, if we consider the transverse bore 72 from its opening 72a, outside which can extend beyond the free end of the drawer, to its bottom 72b, we see that the third, first and second conduits 84, 75 (76) and 82 are successively connected to the transverse bore 72.

Les ouvertures de ces trois conduits dans l'alésage sont régulièrement espacées. L'espacement entre les deux renflements 88 et 90 du corps du tiroir est très légèrement supérieur à l'espacement entre deux conduits. Ainsi, lorsque le tiroir est avancé vers le fond de l'alésage, les conduits 76 et 82 peuvent être mis en communication puisque leurs ouvertures se trouvent entre les renflements 88 et 90, tandis que le conduit 84 est isolé des deux autres par le renflement 90. Lorsque, en revanche, le tiroir est éloigné du fond de l'alésage, les ouvertures des conduits 84 et 76 se trouvent entre les renflements 88 et 90 et sont donc mises en communication, tandis que l'ouverture du conduit 82 est isolée des deux autres par le renflement 88.The openings of these three conduits in the bore are regularly spaced. The spacing between the two bulges 88 and 90 of the body of the drawer is very slightly greater than the spacing between two conduits. Thus, when the slide is advanced towards the bottom of the bore, the conduits 76 and 82 can be brought into communication since their openings are located between the bulges 88 and 90, while the conduit 84 is isolated from the other two by the bulge 90. When, on the other hand, the slide is moved away from the bottom of the bore, the openings of the conduits 84 and 76 are located between the bulges 88 and 90 and are therefore placed in communication, while the opening of the conduit 82 is isolated of the other two by the bulge 88.

Le fonctionnement du dispositif est le suivant. Lorsque le tiroir 70 est poussé vers le fond 72b de l'alésage 72, ce qui est possible grâce au fait que l'air se trouvant en avant du renflement 88 peut être chassé par le perçage d'évacuation 92, le fluide entrant par les conduits 68, 74 et 76 peut entrer à l'arrière de la deuxième chambre 14 par le deuxième conduit 82 de la paroi de séparation 28. Ce fluide tend donc à repousser vers l'avant le deuxième piston 20. Dans le même temps, le fluide pénètre par le perçage 62 dans le perçage 60 de la tige 24 et est ainsi conduit jusqu'à l'arrière de la première chambre axiale 12, de sorte que son action s'exerce également à l'arrière du premier piston 18. De même, le fluide pénétrant par le perçage 62 est conduit jusqu'à l'arrière du troisième piston 22 par les perçages 64 et 66 de la tige de liaison supplémentaire 26, de sorte que son action s'exerce également sur la face arrière du troisième piston 22. L'action du fluide s'exerce ainsi sur les trois pistons à la fois ce qui augmente son efficacité.The operation of the device is as follows. When the slide 70 is pushed towards the bottom 72b of the bore 72, which is possible thanks to the fact that the air located in front of the bulge 88 can be expelled by the discharge bore 92, the fluid entering through the conduits 68, 74 and 76 can enter the rear of the second chamber 14 through the second conduit 82 of the partition wall 28. This fluid therefore tends to push the second piston 20 forward. At the same time, the fluid penetrates through the bore 62 in the bore 60 of the rod 24 and is thus led to the rear of the first axial chamber 12, so that its action is also exerted at the rear of the first piston 18. From even, the fluid penetrating through the bore 62 is led to the rear of the third piston 22 by the holes 64 and 66 of the additional connecting rod 26, so that its action is also exerted on the rear face of the third piston 22. The action of the fluid is thus exerted on the three pi stons at the same time which increases its effectiveness.

Il faut noter que des moyens d'évacuation du fluide se trouvant dans la partie avant des chambres lorsque les pistons sont repoussés vers l'avant sont prévus. En ce qui concerne la première chambre 12, le conduit 84 est mis en communication avec l'extérieur par un perçage 94 qui équipe la bague 96 de guidage de la tige 98 du tiroir 70. En ce qui concerne la chambre 14, le fluide situé à l'avant de cette chambre est directement évacué par un perçage 100 pratiqué dans la paroi de cette chambre, à son extrémité avant. Enfin, le fluide situé dans la partie avant de la troisième chambre 16 peut naturellement s'évacuer à l'avant de cette chambre du fait qu'aucun système d'étanchéité n'est prévu entre l'organe d'avancement, les bras de support 46 et la bague 48.It should be noted that means for discharging the fluid located in the front part of the chambers when the pistons are pushed forward are provided. As regards the first chamber 12, the conduit 84 is placed in communication with the outside by a bore 94 which equips the ring 96 for guiding the rod 98 of the drawer 70. With regard to the chamber 14, the fluid located at the front of this chamber is directly evacuated by a bore 100 made in the wall of this chamber, at its front end. Finally, the fluid located in the front part of the third chamber 16 can naturally be evacuated at the front of this chamber because no sealing system is provided between the advancing member, the arms of support 46 and ring 48.

Lorsque, en revanche, le tiroir 70 est repoussé de manière à s'éloigner du fond 72b de l'alésage 72, position déterminée par la coopération en butée du renflement 90 et de la bague 96, l'air entrant par les conduits 68, 74 et 76 peut entrer dans la partie avant de la première chambre axiale 12 par le troisième conduit 84 de la paroi 28. Ainsi, l'ensemble constitué par les pistons et leurs tiges de liaison est repoussé vers l'arrière par l'action du fluide sur la face avant du premier piston 18. Il n'est pas nécessaire à cette occasion de démultiplier l'effet obtenu en faisant agir le fluide sur les autres pistons. Dans la mesure où les parties arrières des chambres 12, 14 et 16 communiquent par les perçages des tiges de piston, l'air chassé dans ces parties arrières lorsque l'ensemble est repoussé se retrouve dans la partie arrière de la deuxième chambre 14 et peut être chassé vers l'extérieur par le deuxième conduit 82 de la paroi de séparation 28 qui, lorsque le tiroir est dans sa deuxième position, communique directement avec l'atmosphère par le perçage d'évacuation 92.When, on the other hand, the slide 70 is pushed back so as to move away from the bottom 72b of the bore 72, position determined by the cooperation in abutment of the bulge 90 and of the ring 96, the air entering through the conduits 68, 74 and 76 can enter the front part of the first axial chamber 12 through the third conduit 84 of the wall 28. Thus, the assembly formed by the pistons and their connecting rods is pushed backwards by the action of the fluid on the front face of the first piston 18. It is not necessary on this occasion to multiply the effect obtained by causing the fluid to act on the other pistons. Insofar as the rear parts of the chambers 12, 14 and 16 communicate through the holes in the piston rods, the air expelled into these rear parts when the assembly is pushed back is found in the rear part of the second chamber 14 and can be driven outward through the second conduit 82 of the partition wall 28 which, when the drawer is in its second position, communicates directly with the atmosphere by the discharge bore 92.

Les moyens de commande de la vanne à tiroir comprennent un levier de commande 102 disposé sensiblement transversalement. Comme on le voit mieux sur la figure 2, ce levier 102 a une première extrémité 102a raccordée au corps de vérin 10 dans la région de la paroi de séparation 28. Cette première extrémité 102a est montée pivotante autour d'un axe de pivotement 104, mieux visible sur les figures 1 et 4 dirigées sensiblement selon l'axe A du corps de vérin. La deuxième extrémité 102b du levier 102 coopère avec l'extrémité libre 99 du tiroir 70.The control means of the slide valve comprise a control lever 102 disposed substantially transversely. As can best be seen in FIG. 2, this lever 102 has a first end 102a connected to the cylinder body 10 in the region of the partition wall 28. This first end 102a is pivotally mounted around a pivot axis 104, better visible in Figures 1 and 4 directed substantially along the axis A of the cylinder body. The second end 102b of the lever 102 cooperates with the free end 99 of the drawer 70.

Il faut noter que ce levier est directement relié à la paroi de séparation 28, et se trouve par conséquent seulement situé dans une région centrale du corps du vérin. Dans un souci de limiter l'encombrement du dispositif, la paroi de séparation présente une fente transversale 29 dans laquelle est logée la première extrémité 102a du levier. Lorsque la deuxième extrémité 102b du levier est poussée de manière à repousser le tiroir 70 vers le fond 72b de l'alésage, le levier 102 est presque entièrement contenu dans la fente 29. Dans l'exemple représenté, pour obtenir un bras de levier suffisant, les première et deuxième extrémités du levier sont relativement distantes l'une de l'autre. Ainsi, le levier s'étend sur plus d'un quart de la circonférence du corps de vérin. C'est donc également le cas de la fente 29 qui le reçoit dans sa majeure partie. Le levier étant coudé, la fente 29 l'est également.It should be noted that this lever is directly connected to the partition wall 28, and is therefore only located in a central region of the cylinder body. In order to limit the size of the device, the partition wall has a transverse slot 29 in which is housed the first end 102a of the lever. When the second end 102b of the lever is pushed so as to push the slide 70 towards the bottom 72b of the bore, the lever 102 is almost entirely contained in the slot 29. In the example shown, to obtain a sufficient lever arm , the first and second ends of the lever are relatively distant from each other. Thus, the lever extends over more than a quarter of the circumference of the cylinder body. It is therefore also the case of the slot 29 which receives it for the most part. The lever being bent, the slot 29 is also.

Le dispositif comporte avantageusement des moyens élastiques pour solliciter naturellement le tiroir 70 dans sa deuxième position, dans laquelle l'organe d'avancement est repoussé vers l'arrière. Ceci permet de faire en sorte que la situation naturelle du dispositif soit celle dans laquelle les bras de pince 52 sont inactifs, et que leur actionnement nécessite une action positive sur le tiroir 70, action qui cesse dès que l'on s'arrête de manipuler le levier. Dans l'exemple représenté, ces moyens élastiques sont constitués par un simple ressort 106 qui prend appui, d'une part, sur la face interne de l'extrémité libre élargie 99 du tiroir et, d'autre part, sur la face externe de la bague de guidage 96, fixée dans l'alésage 72, dans laquelle coulisse la tige 98 du tiroir. On pourrait également prévoir d'autres types de moyens élastiques, par exemple un ressort spirale éventuellement disposé entre le fond 72b de l'alésage et l'extrémité interne du tiroir situé en-deçà du renflement 88.The device advantageously comprises elastic means for naturally urging the drawer 70 into its second position, in which the advancement member is pushed back. This makes it possible for the natural situation of the device to be that in which the arms of clamp 52 are inactive, and their actuation requires a positive action on the drawer 70, action which ceases as soon as one stops manipulating the lever. In the example shown, these elastic means consist of a simple spring 106 which bears, on the one hand, on the internal face of the enlarged free end 99 of the drawer and, on the other hand, on the external face of the guide ring 96, fixed in the bore 72, in which the rod 98 of the drawer slides. One could also provide other types of elastic means, for example a spiral spring possibly disposed between the bottom 72b of the bore and the internal end of the slide located below the bulge 88.

Le dispositif comporte avantageusement des moyens pour amortir le mouvement d'au moins l'un des pistons en fin de course de déplacement, dans au moins l'un des sens de déplacement de l'organe d'avancement. Les pistons étant reliés les uns aux autres par les tiges de liaison, ces moyens amortissent en fait, le déplacement de l'ensemble constitué par les pistons, leur tige et l'organe d'avancement.The device advantageously comprises means for damping the movement of at least one of the pistons at the end of the travel stroke, in at least one of the directions of movement of the advancement member. The pistons being connected to each other by the connecting rods, these means in fact absorb the movement of the assembly formed by the pistons, their rod and the advancement member.

Dans l'exemple représenté, ces moyens d'amortissement sont constitués par un renflement 108 en matériau relativement souple, par exemple du type caoutchouc ou analogue, ménagé sur la face arrière du premier piston 18. Ainsi, lorsque l'ensemble constitué par les pistons et leur tige de liaison est ramené vers l'arrière dans la position de la figure 1, ce renflement 108 coopère avec la face arrière de la première chambre 12.In the example shown, these damping means consist of a bulge 108 made of a relatively flexible material, for example of the rubber type or the like, formed on the rear face of the first piston 18. Thus, when the assembly formed by the pistons and their connecting rod is brought back towards the position of FIG. 1, this bulge 108 cooperates with the rear face of the first chamber 12.

On peut également prévoir d'équiper la face avant de l'un des pistons, par exemple également le piston arrière, d'un renflement du même type pour amortir le déplacement vers l'avant. Dans l'exemple représenté, le piston 18 comporte en fait un noyau métallique 18a et une bague externe 18b, en matériau relativement souple, qui entoure ce noyau et est pourvue de renflements. Il est avantageux que la position d'extrême avancement de l'ensemble, qui définit évidemment la position extrême avant de l'organe d'avancement 40, soit très précisément définie pour que la position active des mâchoires 52a le soit également. Dans cette optique, le dispositif comporte avantageusement des premiers moyens de butée disposés dans l'une des chambres axiales, au voisinage de son extrémité avant, et des deuxièmes moyens de butée disposés sur le piston qui se trouve sur cette chambre, au voisinage de la face avant de ce piston. Ainsi, les premier et deuxième moyens de butée coopèrent entre eux lorsque l'ensemble constitué par les pistons, leur tige de liaison et l'organe d'avancement est repoussé vers l'avant, de telle sorte qu'ils définissent la position d'extrême avancement de cet ensemble.It is also possible to provide the front face of one of the pistons, for example also the rear piston, with a bulge of the same type to dampen the movement towards the front. In the example shown, the piston 18 in fact comprises a metal core 18a and an outer ring 18b, of relatively flexible material, which surrounds this core and is provided with bulges. It is advantageous that the position of extreme advancement of the assembly, which obviously defines the extreme front position of the advancement member 40, is very precisely defined so that the active position of the jaws 52a is also. With this in mind, the device advantageously comprises first abutment means arranged in one of the axial chambers, in the vicinity of its front end, and second abutment means arranged on the piston which is located in this chamber, in the vicinity of the front of this piston. Thus, the first and second stop means cooperate with each other when the assembly constituted by the pistons, their connecting rod and the advancement member is pushed forward, so that they define the position of extreme advancement of this assembly.

Dans l'exemple représenté, ces moyens de butée sont très simples puisque les premiers moyens de butée sont constitués par la face avant de la troisième chambre 16, face avant elle-même définie par les extrémités arrières 46b des bras de support 46, tandis que les deuxièmes moyens de butée sont constitués par la face avant 22a du troisième piston 22. On peut évidemment prévoir de réaliser ces moyens de butée dans une autre des chambres axiales. Toutefois, la position précise des bras 46 est déterminée par le vissage de la bague d'assemblage 48. Ceci permet de définir précisément la position du premier moyen de butée, en laissant une possibilité de réglage.In the example shown, these abutment means are very simple since the first abutment means are constituted by the front face of the third chamber 16, the front face itself defined by the rear ends 46b of the support arms 46, while the second abutment means consist of the front face 22a of the third piston 22. It is obviously possible to provide for these abutment means in another of the axial chambers. However, the precise position of the arms 46 is determined by the screwing of the assembly ring 48. This makes it possible to precisely define the position of the first stop means, leaving a possibility of adjustment.

Pour faciliter le déplacement des pistons et éviter tout risque de broutage, le dispositif comporte avantageusement au moins un coussinet annulaire 110 disposé dans l'alésage 30 de la paroi de séparation 28 et réalisé dans un matériau à faible coefficient de frottement. Ainsi, ce coussinet peut coopérer avec la périphérie externe de la tige de liaison 24 en facilitant son coulissement dans l'alésage. Un coussinet analogue 112 est également disposé dans l'alésage 36 de la paroi de séparation supplémentaire, lorsque celle-ci est présente. Bien entendu, le fait de prévoir ces coussinets n'exclut pas la disposition des joints d'étanchéité 32 et 38 dans les alésages.To facilitate the movement of the pistons and avoid any risk of chattering, the device advantageously comprises at least one annular bearing 110 disposed in the bore 30 of the partition wall 28 and made of a material with a low coefficient of friction. Thus, this bearing can cooperate with the external periphery of the connecting rod 24 by facilitating its sliding in the bore. A similar pad 112 is also placed in the bore 36 of the additional partition wall, when the latter is present. Of course, the fact of providing these bearings does not exclude the arrangement of the seals 32 and 38 in the bores.

Les faces périphériques des différents pistons coopérant avec les parois axiales des chambres, sont pourvues de joints d'étanchéité 118, 120 et 122. Les extrémités avant et arrière des tiges de liaison 24 et 26 coopèrent par vissage. Pour caler les pistons sur ces tiges, des rondelles de calage 124 équipent les faces arrières des pistons 20 et 22. L'extrémité arrière de la tige de liaison 24 est filetée. La face arrière du premier piston 18 présente un renfoncement 126 apte à recevoir un écrou 128 de fixation vissé sur l'extrémité arrière de la tige. La position du piston par rapport à la tige est calée à l'aide d'une rondelle de calage 130 située sur la face avant de ce piston et coopérant avec un épaulement de la tige.The peripheral faces of the different pistons cooperating with the axial walls of the chambers are provided with seals 118, 120 and 122. The front and rear ends of the connecting rods 24 and 26 cooperate by screwing. To wedge the pistons on these rods, wedging washers 124 equip the rear faces of the pistons 20 and 22. The rear end of the connecting rod 24 is threaded. The rear face of the first piston 18 has a recess 126 capable of receiving a fixing nut 128 screwed onto the rear end of the rod. The position of the piston relative to the rod is locked using a wedging washer 130 located on the front face of this piston and cooperating with a shoulder of the rod.

Il faut enfin noter que le corps de vérin comporte trois éléments principaux constitués par des tubes borgnes. Le premier tube 132 définit la première chambre 12. Ces parois arrières et latérales comportent les conduits de branchement à l'arrivée de fluide sous pression. La cavité du deuxième tube 134 forme la deuxième chambre axiale 14. La paroi arrière de ce tube constitue la paroi de séparation entre les chambres 12 et 14. C'est donc elle qui est pourvue de l'alésage 72 et des différents conduits précédemment évoqués. Cette paroi est raccordée par vissage à l'extrémité avant du premier tube 132. De même, la cavité du troisième tube 136 forme la troisième chambre axiale 16, tandis que sa paroi arrière forme la paroi 34 de séparation entre les chambres 14 et 16. Cette paroi arrière est vissée dans l'extrémité avant du deuxième tube 134. Bien entendu, pour garantir l'étanchéité des chambres, des joints d'étanchéité 138 sont disposés dans la zone de vissage entre les différents tubes.Finally, it should be noted that the jack body has three main elements constituted by blind tubes. The first tube 132 defines the first chamber 12. These rear and side walls have the connection pipes at the pressurized fluid inlet. The cavity of the second tube 134 forms the second axial chamber 14. The rear wall of this tube constitutes the partition wall between the chambers 12 and 14. It is therefore it which is provided with the bore 72 and the various conduits previously mentioned. . This wall is connected by screwing to the front end of the first tube 132. Similarly, the cavity of the third tube 136 forms the third axial chamber 16, while its rear wall forms the wall 34 of separation between the chambers 14 and 16. This rear wall is screwed into the front end of the second tube 134. Of course, to guarantee the tightness of the chambers, seals 138 are arranged in the screwing zone between the different tubes.

Claims (8)

Dispositif de vérin pneumatique comprenant un corps de vérin (10), des moyens d'amenée de fluide sous pression à l'intérieur de ce corps, un premier piston (18) mobile dans une première chambre axiale (12) située à l'arrière du corps de vérin et, au moins, un deuxième piston mobile (20) dans une deuxième chambre axiale (14) située en avant de ladite première chambre axiale, le dispositif comprenant, en outre, une paroi de séparation (28) des deux chambres axiales présentant un alésage axial (30) et une tige de liaison (24) des pistons (18, 20) apte à coulisser de manière étanche dans cet alésage, cette tige présentant un perçage (60) qui débouche, d'une part, dans la première chambre axiale (12) à l'arrière du premier piston (18) et, d'autre part, dans la deuxième chambre axiale (14) à l'arrière du deuxième piston (20), les pistons étant raccordés à un organe d'avancement (40) situé à l'avant du corps de vérin (10), les moyens d'amenée de fluide sous pression comprenant une vanne à tiroir (70, 72) commandée par des moyens de commande entre une première position dans laquelle le fluide est dirigé dans au moins une chambre axiale, à l'arrière du piston contenu dans cette chambre, pour solliciter l'organe d'avancement vers l'avant et une deuxième position dans laquelle le fluide est dirigé dans au moins une chambre axiale, à l'avant du piston contenu dans cette chambre, pour solliciter l'organe d'avancement vers l'arrière,
   caractérisé en ce que la paroi de séparation (28) présente un alésage transversal (72) dans lequel est situé le tiroir de la vanne à tiroir (70), un premier conduit (74, 76) qui relie l'alésage transversal (72) à une arrivée de fluide sous pression (66, 68), un deuxième conduit (82) qui raccorde l'alésage transversal (72) à la partie arrière de la deuxième chambre axiale (14), en arrière du deuxième piston (10) et un troisième conduit (84) qui raccorde l'alésage transversal (72) à la partie avant de la première chambre axiale (12), en avant du premier piston (18), les premier et deuxième conduits (74, 76 ; 82) étant mis en communication et isolés du troisième conduit (84) dans la première position du tiroir (70) de la vanne à tiroir, tandis que, dans la deuxième position de ce tiroir, les premier et troisième conduits (74, 76 ; 84) sont mis en communication et isolés du deuxième conduit (82).Pneumatic cylinder device comprising a cylinder body (10), means for supplying pressurized fluid inside this body, a first piston (18) movable in a first axial chamber (12) located at the rear of the jack body and, at least, a second movable piston (20) in a second axial chamber (14) located in front of said first axial chamber, the device further comprising a partition wall (28) of the two chambers axial having an axial bore (30) and a connecting rod (24) of the pistons (18, 20) capable of sliding in leaktight manner in this bore, this rod having a bore (60) which opens, on the one hand, into the first axial chamber (12) at the rear of the first piston (18) and, on the other hand, in the second axial chamber (14) at the rear of the second piston (20), the pistons being connected to a member advancement (40) located at the front of the cylinder body (10), the fluid supply means so us pressure comprising a slide valve (70, 72) controlled by control means between a first position in which the fluid is directed into at least one axial chamber, behind the piston contained in this chamber, to urge the forward advancing member and a second position in which the fluid is directed into at least one axial chamber, at the front of the piston contained in this chamber, to urge the advancing member backwards,
characterized in that the partition wall (28) has a transverse bore (72) in which the spool of the spool valve (70) is located, a first conduit (74, 76) which connects the transverse bore (72) at a pressurized fluid inlet (66, 68), a second conduit (82) which connects the transverse bore (72) to the rear part of the second axial chamber (14), behind the second piston (10) and a third conduit (84) which connects the transverse bore (72) to the front part of the first axial chamber (12), in front of the first piston (18), the first and second conduits (74, 76; 82) being placed in communication and isolated from the third duct (84) in the first position of the slide valve (70), while, in the second position of this slide, the first and third ducts (74, 76; 84) are placed in communication and isolated from the second conduit (82). Dispositif selon la revendication 1, caractérisé en ce que les moyens de commande de la vanne à tiroir (70, 72) comprennent un levier de commande (102) disposé sensiblement transversalement, ce levier ayant une première extrémité (102a), raccordée au corps de vérin (10) dans la région de la paroi de séparation (28) et montée pivotante autour d'un axe de pivotement (104) dirigé sensiblement axialement, et une deuxième extrémité (102b) apte à coopérer avec une extrémité libre (99) du tiroir (70) de la vanne à tiroir.Device according to claim 1, characterized in that the control means of the slide valve (70, 72) comprise a control lever (102) arranged substantially transversely, this lever having a first end (102a), connected to the body of cylinder (10) in the region of the partition wall (28) and pivotally mounted about a pivot axis (104) directed substantially axially, and a second end (102b) capable of cooperating with a free end (99) of the drawer (70) of the slide valve. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'il comporte des moyens élastiques (99) pour solliciter naturellement le tiroir (70) de la vanne à tiroir dans sa deuxième position.Device according to claim 1 or 2, characterized in that it comprises elastic means (99) for naturally urging the slide (70) of the slide valve into its second position. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'alésage transversal (72) comporte un fond (72b) et une ouverture (72a) opposée à ce fond, en dehors de laquelle l'extrémité libre du tiroir (70) à tiroir est susceptible de dépasser et en ce que les troisième, premier et deuxième conduits (84, 76, 82) sont successivement raccordés audit alésage transversal (72) dans le sens allant de l'ouverture (72a) au fond (72b) de cet alésage (72).Device according to any one of Claims 1 to 3, characterized in that the transverse bore (72) has a bottom (72b) and an opening (72a) opposite this bottom, outside which the free end of the drawer (70) with drawer is likely to protrude and in that the third, first and second conduits (84, 76, 82) are successively connected to said transverse bore (72) in the direction from the opening (72a) to the bottom ( 72b) of this bore (72). Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il comporte des moyens (108) pour amortir le mouvement d'au moins l'un des pistons en fin de course de déplacement, dans au moins l'un des sens de déplacement de l'organe d'avancement.Device according to any one of Claims 1 to 4, characterized in that it comprises means (108) for damping the movement of at least one of the pistons at the end of the travel stroke, in at least one directions of movement of the advancement member. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'il comporte des premiers moyens de butée (46b) disposés dans l'une (16) des chambres axiales (12, 14, 16), au voisinage de l'extrémité avant de cette dernière, et des deuxièmes moyens de butée (22a) disposés sur le piston (22) situé dans cette chambre, au voisinage de la face avant de ce dernier, les premiers et deuxième moyens de butée étant susceptibles de coopérer entre eux pour définir la position d'extrême avancement de l'organe d'avancement (40).Device according to any one of Claims 1 to 5, characterized in that it comprises first abutment means (46b) arranged in one (16) of the axial chambers (12, 14, 16), in the vicinity of the front end of the latter, and second stop means (22a) disposed on the piston (22) located in this chamber, in the vicinity of the front face of the latter, the first and second stop means being capable of cooperating between them to define the position of extreme advancement of the advancement member (40). Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il comporte au moins un coussinet (110) annulaire disposé dans l'alésage axial (30), réalisé dans un matériau à faible coefficient de frottement et coopérant avec la tige de liaison (24).Device according to any one of Claims 1 to 6, characterized in that it comprises at least one annular bearing (110) disposed in the axial bore (30), made of a material with a low coefficient of friction and cooperating with the connecting rod (24). Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'il comporte un troisième piston (22) mobile dans une troisième chambre axiale (16) située en avant de la deuxième chambre axiale, une paroi de séparation supplémentaire (34), séparant les deuxième et troisième chambres axiales (14, 16) et présentant un alésage axial (36), et une tige de liaison supplémentaire (26), raccordant les deuxième et troisième pistons (20, 22) et apte à coulisser de manière étanche dans cet alésage axial, cette tige de liaison supplémentaire présentant un perçage (64), relié au perçage (60) de la tige de liaison (24) des premier et deuxième pistons (18, 20) et débouchant dans la troisième chambre axiale (16) à l'arrière du troisième piston.Device according to any one of claims 1 to 7, characterized in that it comprises a third piston (22) movable in a third axial chamber (16) located in front of the second axial chamber, an additional partition wall (34), separating the second and third axial chambers (14, 16) and having an axial bore (36), and an additional connecting rod (26), connecting the second and third pistons (20, 22) and able to slide in leaktight manner in this axial bore, this additional connecting rod having a hole (64), connected to the hole (60) of the connecting rod (24) of the first and second pistons (18, 20) and opening into the third axial chamber (16) behind the third piston.
EP97400897A 1996-05-03 1997-04-22 Pneumatic actuating device Expired - Lifetime EP0805278B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9605545A FR2748298B1 (en) 1996-05-03 1996-05-03 PNEUMATIC CYLINDER DEVICE
FR9605545 1996-05-03

Publications (2)

Publication Number Publication Date
EP0805278A1 true EP0805278A1 (en) 1997-11-05
EP0805278B1 EP0805278B1 (en) 2000-08-02

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EP97400897A Expired - Lifetime EP0805278B1 (en) 1996-05-03 1997-04-22 Pneumatic actuating device

Country Status (16)

Country Link
EP (1) EP0805278B1 (en)
JP (1) JPH1037911A (en)
KR (1) KR100227523B1 (en)
CN (1) CN1182004A (en)
AR (1) AR006938A1 (en)
AT (1) ATE195162T1 (en)
BR (1) BR9703061A (en)
CA (1) CA2204077A1 (en)
CZ (1) CZ135197A3 (en)
DE (1) DE69702683T2 (en)
FR (1) FR2748298B1 (en)
HU (1) HUP9700825A3 (en)
NO (1) NO972053L (en)
PL (1) PL319779A1 (en)
TW (1) TW343168B (en)
ZA (1) ZA973812B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1034896A1 (en) * 1998-12-17 2000-09-13 Novartec AG Mounting of pressure jaws
WO2004016398A2 (en) * 2002-08-16 2004-02-26 Stanley Fastening Systems, L.P. Clip applicator tool
US7155955B2 (en) 2001-09-11 2007-01-02 Emerson Electric Co. Crimping assembly
CN109262541A (en) * 2018-09-29 2019-01-25 上海蔚来汽车有限公司 A kind of fastener installation tool
CN113182821A (en) * 2021-05-11 2021-07-30 西安秦泰汽车排放技术有限公司 Device for clamping disc-shaped element

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GB2394000B (en) * 2002-10-10 2007-03-28 Lotus Car An arrangement of an internal combustion engine poppet valve and an actuator therefor
JP4871738B2 (en) 2004-12-24 2012-02-08 一般財団法人阪大微生物病研究会 Attenuated chimeric flavivirus containing the gene of attenuated Japanese encephalitis virus as the backbone
KR100954867B1 (en) 2009-12-31 2010-04-28 유영묵 Pneumatic interlocking controlling device and system
DE102012013409A1 (en) * 2012-05-23 2013-11-28 Atlas Copco Construction Tools Gmbh impact device
WO2016010656A1 (en) * 2014-07-14 2016-01-21 Ridge Tool Company Hydraulic tools with rapid advance
CN105345167A (en) * 2015-11-30 2016-02-24 重庆市首业机械制造有限公司 Clamping mechanism with air cylinder and return tension spring
CN105345163A (en) * 2015-11-30 2016-02-24 重庆市首业机械制造有限公司 Clamping mechanism having worm wheels, worm rods and return magnets
CN105345166A (en) * 2015-11-30 2016-02-24 重庆市首业机械制造有限公司 Camping tool with double bevel gears and reset torsion springs
CN105328278A (en) * 2015-11-30 2016-02-17 重庆市首业机械制造有限公司 Clamping tool provided with two bevel gears and restoring compression springs
CN105345164A (en) * 2015-11-30 2016-02-24 重庆市首业机械制造有限公司 Clamping mechanism having double bevel gears and return tension springs
FR3046820B1 (en) * 2016-01-15 2018-02-16 Valeo Embrayages HYDRAULIC CYLINDER TRANSMITTER WITH IMPROVED SEALING DEVICE
CN111341501B (en) * 2018-12-18 2023-09-26 库迈思控股股份公司 Clamp assembly for cable processing device and cable processing device
DE102021103015B3 (en) 2021-02-09 2022-04-21 Oetiker Schweiz Ag Safety valve for a pneumatically operated tool

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US2766631A (en) * 1950-06-09 1956-10-16 Rotor Tool Company Power multiplying mechanism for portable hand tools
US3410180A (en) * 1966-08-03 1968-11-12 Etc Inc Full stroke compelling mechanism having a pressure responsive valve member within the working chamber
US3485141A (en) * 1967-08-28 1969-12-23 Sargent & Co Multipiston pressure cylinder for tools
CH570242A5 (en) * 1973-02-02 1975-12-15 Amp Inc

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US2766631A (en) * 1950-06-09 1956-10-16 Rotor Tool Company Power multiplying mechanism for portable hand tools
US3410180A (en) * 1966-08-03 1968-11-12 Etc Inc Full stroke compelling mechanism having a pressure responsive valve member within the working chamber
US3485141A (en) * 1967-08-28 1969-12-23 Sargent & Co Multipiston pressure cylinder for tools
CH570242A5 (en) * 1973-02-02 1975-12-15 Amp Inc

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1034896A1 (en) * 1998-12-17 2000-09-13 Novartec AG Mounting of pressure jaws
US7155955B2 (en) 2001-09-11 2007-01-02 Emerson Electric Co. Crimping assembly
WO2004016398A2 (en) * 2002-08-16 2004-02-26 Stanley Fastening Systems, L.P. Clip applicator tool
WO2004016398A3 (en) * 2002-08-16 2004-09-02 Stanley Fastening Sys Lp Clip applicator tool
CN109262541A (en) * 2018-09-29 2019-01-25 上海蔚来汽车有限公司 A kind of fastener installation tool
CN113182821A (en) * 2021-05-11 2021-07-30 西安秦泰汽车排放技术有限公司 Device for clamping disc-shaped element
CN113182821B (en) * 2021-05-11 2022-08-16 西安秦泰汽车排放技术有限公司 Device for clamping disc-shaped element

Also Published As

Publication number Publication date
KR100227523B1 (en) 1999-11-01
AR006938A1 (en) 1999-09-29
CN1182004A (en) 1998-05-20
NO972053D0 (en) 1997-05-02
HU9700825D0 (en) 1997-06-30
KR970075390A (en) 1997-12-10
NO972053L (en) 1997-11-04
ZA973812B (en) 1997-12-01
HUP9700825A3 (en) 1999-03-29
DE69702683T2 (en) 2001-04-05
JPH1037911A (en) 1998-02-13
MX9703307A (en) 1998-05-31
DE69702683D1 (en) 2000-09-07
EP0805278B1 (en) 2000-08-02
PL319779A1 (en) 1997-11-10
CZ135197A3 (en) 1997-11-12
ATE195162T1 (en) 2000-08-15
BR9703061A (en) 1998-09-01
HUP9700825A2 (en) 1998-04-28
FR2748298A1 (en) 1997-11-07
TW343168B (en) 1998-10-21
CA2204077A1 (en) 1997-11-03
FR2748298B1 (en) 1998-07-31

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